Differential frequency mixing frequency cascade magnesium-doped near-stoichiometric ratio lithium niobate optical wavelength converter

A wavelength converter, near-stoichiometric technology, applied in instruments, optics, nonlinear optics, etc., can solve the problems of electro-optic coefficient and nonlinear coefficient decrease, unstable waveguide refractive index distribution, difficult to obtain tunable lasers, etc. Achieve the effect of improving nonlinear conversion efficiency, increasing flexibility, and reducing cost

Inactive Publication Date: 2010-11-17
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (2)H:LiNbO 3 The transmission loss of the optical waveguide is relatively large;
[0012] (3) The refractive index distribution of the waveguide is unstable and changes with the storage time;
[0013] (4) Electro-optic coefficient and nonlinear coefficient drop seriously
However, in practical applications, there are some problems in the difference-frequency all-optical wavelength conversion: the light in the 770nm band is generally distributed in a multi-mode form in the waveguide, which is not conducive to transmission, and the pump light in the 770nm band and the signal light in the 1550nm band are simultaneously Coupling into optical waveguides is technically complex; in addition, high-power narrow-linewidth tunable lasers in the 770nm band are also difficult to obtain

Method used

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Comparison scheme
Effect test

Embodiment 1

[0033] The present invention selects a near-stoichiometric lithium niobate (Mg:SLiNbO) based on magnesium doping 3 ) wafer; then fabricate a proton exchange optical waveguide on the wafer; after completing the proton exchange process, the waveguide is annealed; after annealing, an antiproton exchange is performed on the surface of the waveguide to form a buried proton exchange waveguide; The sector-shaped ferroelectric domain periodic inversion structure with a period range of 17-19 μm, that is, the wafer is polarized by an electric field at room temperature to realize the periodic inversion of the polarized domain of the wafer, so as to obtain a wide tuning range with stable performance and low loss. Optical wavelength converter. The wavelength converter is a single-domain dielectric wafer with a ferroelectric domain period reversal structure, and the upper and lower surfaces of the wafer are parallel.

Embodiment 2

[0035] The present invention comprises the following steps:

[0036] (1) Select a dielectric body, which is a ferroelectric single-domain crystal that grows spontaneously polarized along the Z direction during the growth process, and is a doped molar ratio of 2% or 3%. The near-stoichiometric ratio of miscellaneous magnesium ([Li]:[Nb]=48.5:51.5) lithium niobate (Mg:SLiNbO 3 ), cutting along the Z direction of the dielectric body, its thickness is 0.5mm, the upper and lower surfaces are parallel and both are polished, and the normal direction of the upper and lower surfaces is along the spontaneous polarization direction of the crystal; the cutting, its thickness is 0.2 to 1mm .

[0037] (2) Fabricate an annealed proton exchange optical waveguide (APE) optical waveguide on the +Z surface of the wafer. First in LiNbO 3 Deposit a layer of SiO with appropriate thickness on the wafer 2 As a mask; use photolithography to etch out its waveguide part, and other parts still have a...

Embodiment 3

[0042] Embodiment 3: the present invention comprises the following steps:

[0043] (1) Choose a magnesium-doped lithium niobate wafer with a thickness of 0.5mm, a length of 20mm, and a width of 5mm with a doping molar ratio of 2%, cut along the Z surface, and polish ± Z surfaces; for the cutting, the thickness is 0.2 to 1mm.

[0044] (2) Fabricate a series of waveguides with a width of 6 μm on the +Z surface using antiproton exchange technology; the antiproton exchange technology is to use LiNbO with 6 μm waveguide mask openings at a temperature of 200 ° C 3 The wafer was placed in an exchange source (pure benzoic acid C 6 h 5 Exchange in OOH); take out the wafer after 4 to 10 hours, send it into the quartz tube, increase the temperature in the tube to 350°C, and introduce oxygen to anneal the crystal; slowly pull the crystal out of the tube after annealing, and then put it into Antiproton exchange (KNO 3 :NaNO 3 :LiNbO 3 ) within 1 hour, the Li ions in the mixed solutio...

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Abstract

Disclosed is a difference frequency mixing magnesium-doped near-stoichiometric LiNbO3 all-optical wavelength converter, which uses the magnesium-doped near-stoichiometric LiNbO3 (Mg: SLiNbO3) as materials and has no photorefractive damage problem at room temperature and has no need for high-temperature compensation so as to simplify the system and reduce costs; as the converter increases the Li / Nb ratio and doped magnesium, the converter greatly reduces the coercive field of the crystal, reduces the polarized pulse voltage, increases the production thickness of the crystal and felicitates thelight energy to couple with inlet devices; the converter adopts the anti-proton exchange technology to produce PRE optical waveguide and can effectively reduce waveguide loss and improve the non-linear conversion efficiency; the converter uses a fan-shaped grating structure to obtain a plurality of waveguides with continuous varying cycles on the same wafer so as to improve the flexibility of thedevice and enable the materials to be fully utilized; without lowering the conversion efficiency and changing the wavelength conversion output spectrum, the converter achieves ultra-wideband NM multi-wavelength channel conversion.

Description

technical field [0001] The invention relates to a difference-frequency mixing cascaded magnesium-doped near-chemical ratio lithium niobate all-optical wavelength converter, and a frequency-doubling difference-frequency wavelength converter based on a cascade structure. This is an all-optical device, which is mainly suitable for wavelength division multiplexing optical communication systems, and can realize broadband tunable single-channel optical wavelength conversion or multi-channel simultaneous wavelength conversion in the system. The invention specifically includes the preparation of near-chemical ratio magnesium-doped lithium niobate waveguide and the design and manufacture process of quasi-phase matching periodic microstructure. The invention belongs to the field of crystal material science and the field of optical communication. Background technique [0002] Dense Wavelength Division Multiplexing (DWDM) is currently widely used in optical fiber communication networks...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02F1/365
Inventor 陈云琳刘刚瞻鹤
Owner BEIJING JIAOTONG UNIV
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